[turbofan] Merge GenericNode with Node.

src/compiler/node.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_NODE_H_
 #define V8_COMPILER_NODE_H_
 
 #include <deque>
 #include <set>
 #include <vector>
 
 #include "src/compiler/generic-algorithm.h"
-#include "src/compiler/generic-node.h"
 #include "src/compiler/opcodes.h"
 #include "src/compiler/operator.h"
 #include "src/types.h"
 #include "src/zone.h"
 #include "src/zone-allocator.h"
+#include "src/zone-containers.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
-class NodeData {
+// A Node is the basic primitive of an IR graph. In addition to the graph
+// book-keeping Nodes only contain a mutable Operator that may change
+// during compilation, e.g. during lowering passes.  Other information that
+// needs to be associated with Nodes during compilation must be stored
+// out-of-line indexed by the Node's id.
+class Node FINAL {
  public:
+  Node(GenericGraphBase* graph, int input_count, int reserve_input_count);
+
+  void Initialize(const Operator* op) { set_op(op); }
+
+  bool IsDead() const { return InputCount() > 0 && InputAt(0) == NULL; }
+  void Kill();
+
+  void CollectProjections(ZoneVector<Node*>* projections);
+  Node* FindProjection(size_t projection_index);
+
   const Operator* op() const { return op_; }
   void set_op(const Operator* op) { op_ = op; }
 
   IrOpcode::Value opcode() const {
     DCHECK(op_->opcode() <= IrOpcode::kLast);
     return static_cast<IrOpcode::Value>(op_->opcode());
   }
 
- protected:
+  inline NodeId id() const { return id_; }
+
+  int InputCount() const { return input_count_; }
+  Node* InputAt(int index) const {
+    return static_cast<Node*>(GetInputRecordPtr(index)->to);
+  }
+
+  void ReplaceInput(int index, Node* new_input);
+  void AppendInput(Zone* zone, Node* new_input);
+  void InsertInput(Zone* zone, int index, Node* new_input);
+  void RemoveInput(int index);
+
+  int UseCount() { return use_count_; }
+  Node* UseAt(int index) {
+    DCHECK(index < use_count_);
+    Use* current = first_use_;
+    while (index-- != 0) {
+      current = current->next;
+    }
+    return current->from;
+  }
+  void ReplaceUses(Node* replace_to);
+  template <class UnaryPredicate>
+  inline void ReplaceUsesIf(UnaryPredicate pred, Node* replace_to);
+  void RemoveAllInputs();
+
+  void TrimInputCount(int input_count);
+
+  class Inputs {
+   public:
+    class iterator;
+    iterator begin();
+    iterator end();
+
+    explicit Inputs(Node* node) : node_(node) {}
+
+   private:
+    Node* node_;
+  };
+
+  Inputs inputs() { return Inputs(this); }
+
+  class Uses {
+   public:
+    class iterator;
+    iterator begin();
+    iterator end();
+    bool empty();  // { return begin() == end(); }
+
+    explicit Uses(Node* node) : node_(node) {}
+
+   private:
+    Node* node_;
+  };
+
+  Uses uses() { return Uses(this); }
+
+  class Edge;
+
+  bool OwnedBy(Node* owner) const;
+
+  static Node* New(GenericGraphBase* graph, int input_count, Node** inputs,
+                   bool has_extensible_inputs);
+
+
+ private:
   const Operator* op_;
   Bounds bounds_;
-  explicit NodeData(Zone* zone) {}
 
   friend class NodeProperties;
   Bounds bounds() { return bounds_; }
   void set_bounds(Bounds b) { bounds_ = b; }
-};
-
-// A Node is the basic primitive of an IR graph. In addition to the members
-// inherited from Vector, Nodes only contain a mutable Operator that may change
-// during compilation, e.g. during lowering passes.  Other information that
-// needs to be associated with Nodes during compilation must be stored
-// out-of-line indexed by the Node's id.
-class Node FINAL : public GenericNode<NodeData, Node> {
+
+  friend class GenericGraphBase;
+
+  class Use : public ZoneObject {
+   public:
+    Node* from;
+    Use* next;
+    Use* prev;
+    int input_index;
+  };
+
+  class Input {
+   public:
+    Node* to;
+    Use* use;
+
+    void Update(Node* new_to);
+  };
+
+  void EnsureAppendableInputs(Zone* zone);
+
+  Input* GetInputRecordPtr(int index) const {
+    if (has_appendable_inputs_) {
+      return &((*inputs_.appendable_)[index]);
+    } else {
+      return inputs_.static_ + index;
+    }
+  }
+
+  void AppendUse(Use* use);
+  void RemoveUse(Use* use);
+
+  void* operator new(size_t, void* location) { return location; }
+
+  void AssignUniqueID(GenericGraphBase* graph);
+
+  typedef ZoneDeque<Input> InputDeque;
+
+  static const int kReservedInputCountBits = 2;
+  static const int kMaxReservedInputs = (1 << kReservedInputCountBits) - 1;
+  static const int kDefaultReservedInputs = kMaxReservedInputs;
+
+  NodeId id_;
+  int input_count_ : 29;
+  unsigned int reserve_input_count_ : kReservedInputCountBits;
+  bool has_appendable_inputs_ : 1;
+  union {
+    // When a node is initially allocated, it uses a static buffer to hold its
+    // inputs under the assumption that the number of outputs will not increase.
+    // When the first input is appended, the static buffer is converted into a
+    // deque to allow for space-efficient growing.
+    Input* static_;
+    InputDeque* appendable_;
+  } inputs_;
+  int use_count_;
+  Use* first_use_;
+  Use* last_use_;
+
+  DISALLOW_COPY_AND_ASSIGN(Node);
+};
+
+class Node::Edge {
  public:
-  Node(GenericGraphBase* graph, int input_count, int reserve_input_count)
-      : GenericNode<NodeData, Node>(graph, input_count, reserve_input_count) {}
-
-  void Initialize(const Operator* op) { set_op(op); }
-
-  bool IsDead() const { return InputCount() > 0 && InputAt(0) == NULL; }
-  void Kill();
-
-  void CollectProjections(ZoneVector<Node*>* projections);
-  Node* FindProjection(size_t projection_index);
-};
+  Node* from() const { return input_->use->from; }
+  Node* to() const { return input_->to; }
+  int index() const {
+    int index = input_->use->input_index;
+    DCHECK(index < input_->use->from->input_count_);
+    return index;
+  }
+
+ private:
+  friend class Node::Uses::iterator;
+  friend class Node::Inputs::iterator;
+
+  explicit Edge(Node::Input* input) : input_(input) {}
+
+  Node::Input* input_;
+};
+
+
+// A forward iterator to visit the nodes which are depended upon by a node
+// in the order of input.
+class Node::Inputs::iterator {
+ public:
+  iterator(const Node::Inputs::iterator& other)  // NOLINT
+      : node_(other.node_),
+        index_(other.index_) {}
+
+  Node* operator*() { return GetInput()->to; }
+  Node::Edge edge() { return Node::Edge(GetInput()); }
+  bool operator==(const iterator& other) const {
+    return other.index_ == index_ && other.node_ == node_;
+  }
+  bool operator!=(const iterator& other) const { return !(other == *this); }
+  iterator& operator++() {
+    DCHECK(node_ != NULL);
+    DCHECK(index_ < node_->input_count_);
+    ++index_;
+    return *this;
+  }
+  iterator& UpdateToAndIncrement(Node* new_to) {
+    Node::Input* input = GetInput();
+    input->Update(new_to);
+    index_++;
+    return *this;
+  }
+  int index() { return index_; }
+
+ private:
+  friend class Node;
+
+  explicit iterator(Node* node, int index) : node_(node), index_(index) {}
+
+  Input* GetInput() const { return node_->GetInputRecordPtr(index_); }
+
+  Node* node_;
+  int index_;
+};
+
+// A forward iterator to visit the uses of a node. The uses are returned in
+// the order in which they were added as inputs.
+class Node::Uses::iterator {
+ public:
+  iterator(const Node::Uses::iterator& other)  // NOLINT
+      : current_(other.current_),
+        index_(other.index_) {}
+
+  Node* operator*() { return current_->from; }
+  Node::Edge edge() { return Node::Edge(CurrentInput()); }
+
+  bool operator==(const iterator& other) { return other.current_ == current_; }
+  bool operator!=(const iterator& other) { return other.current_ != current_; }
+  iterator& operator++() {
+    DCHECK(current_ != NULL);
+    index_++;
+    current_ = current_->next;
+    return *this;
+  }
+  iterator& UpdateToAndIncrement(Node* new_to) {
+    DCHECK(current_ != NULL);
+    index_++;
+    Node::Input* input = CurrentInput();
+    current_ = current_->next;
+    input->Update(new_to);
+    return *this;
+  }
+  int index() const { return index_; }
+
+ private:
+  friend class Node::Uses;
+
+  iterator() : current_(NULL), index_(0) {}
+  explicit iterator(Node* node) : current_(node->first_use_), index_(0) {}
+
+  Input* CurrentInput() const {
+    return current_->from->GetInputRecordPtr(current_->input_index);
+  }
+
+  Node::Use* current_;
+  int index_;
+};
+
+
+template <class UnaryPredicate>
+inline void Node::ReplaceUsesIf(UnaryPredicate pred, Node* replace_to) {
+  for (Use* use = first_use_; use != NULL;) {
+    Use* next = use->next;
+    if (pred(use->from)) {
+      RemoveUse(use);
+      replace_to->AppendUse(use);
+      use->from->GetInputRecordPtr(use->input_index)->to = replace_to;
+    }
+    use = next;
+  }
+}
 
 std::ostream& operator<<(std::ostream& os, const Node& n);
 
-typedef GenericGraphVisit::NullNodeVisitor<NodeData, Node> NullNodeVisitor;
+typedef GenericGraphVisit::NullNodeVisitor<Node> NullNodeVisitor;
 
 typedef std::set<Node*, std::less<Node*>, zone_allocator<Node*> > NodeSet;
 typedef NodeSet::iterator NodeSetIter;
 typedef NodeSet::reverse_iterator NodeSetRIter;
 
 typedef ZoneVector<Node*> NodeVector;
 typedef NodeVector::iterator NodeVectorIter;
 typedef NodeVector::const_iterator NodeVectorConstIter;
 typedef NodeVector::reverse_iterator NodeVectorRIter;
 
 typedef ZoneVector<NodeVector> NodeVectorVector;
 typedef NodeVectorVector::iterator NodeVectorVectorIter;
 typedef NodeVectorVector::reverse_iterator NodeVectorVectorRIter;
 
 typedef Node::Uses::iterator UseIter;
 typedef Node::Inputs::iterator InputIter;
 
 // Helper to extract parameters from Operator1<*> nodes.
 template <typename T>
 static inline const T& OpParameter(const Node* node) {
   return OpParameter<T>(node->op());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_NODE_H_